多煤层条件下高位钻孔瓦斯抽采层位优选研究
Research on optimization of gas drainage height with high-level boreholes under multiple coal seam conditions
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摘要: 为解决多煤层条件下多来源卸压瓦斯高位钻孔抽采层位不清的问题，引入同位素识别技术，并通过现场实测煤层解吸瓦斯及不同层位高位钻孔抽采瓦斯气体组分及碳氢同位素值，计算得出山西腾晖煤矿607工作面高位钻孔瓦斯抽采来源及比例，确定了其高位钻孔瓦斯抽采的最佳层位。结果表明：随着高位钻孔层位的增大，本煤层采空区遗煤瓦斯及下邻近层卸压瓦斯来源占比逐渐增加，上邻近层卸压瓦斯来源占比减小；确定了有效控制本煤层及下邻近层瓦斯的最佳高位钻孔低层位，即距开采煤层顶板7.9~14.2 m，以及有效控制本煤层及上邻近层瓦斯的最佳高位钻孔高层位，即距开采煤层顶板42.1~45.4 m。Abstract: In order to solve the problem of the uncertainty of the height when high-level boreholes are used to extract pressure relief gas from multiple sources under the condition of multiple coal seams, the isotope and gas composition of methane desorbed from the coal cores of the mining seams and their adjacent seams, as well as the methane collected from the methane drainage boreholes at different heights in the gobs were measured. The source and proportion of gas drainage from high-level boreholes at 607 working face of Tenghui Mine in Shanxi Province were calculated, and the optimal height range for gas drainage from high-level boreholes was determined. The optimal position of high borehole and low borehole to effectively control the gas in this coal seam and the adjacent layer below is determined, that is, 7.9 m to 14.2 m away from the roof of mining coal seam. And the best position of high borehole to effectively control the gas in this coal seam and the upper adjacent layer, that is, 42.1 m to 45.4 m away from the roof of mining coal seam.
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